Fourdrinier wire fabric



April 14, 1931. ca. M. PETERSON 1,300,372

' FOURDRINIER WIRE FABRIC Filed Sept. 4. 1930 INVEN TOR.

64 a,, v ZM ATTORNEYS.

Patented Apr. 14, 1931 UNITED STATES PATENT err-Ice GUY M. PETERSON, OF SPRINGFIELD, MASSACHUSETTS, ASSIGNOR TO CHENEY BIGELOW WIRE WORKS, OF SPRINGFIELD, MASSACHUSETTS, A CORPORATION OF MASSACHU- rouanammn WIRE FABRIC Application filed September4, 1980. Serial No. 479,733.

This invention relates to an improved aper making wire fabric such as is used in ourdrinier machines, and has for its object the production of a stronger and more durable fabric without materially increasing the cost and in no way changing or destroying the requisite characteristics of such a fabric for paper making purposes.

the present time Fourdrinier fabric is usually made up of interwoven fine wires of copper or its alloys, bronze and brass, which metal is relatively soft 'and of small tensile strength. In a softwire wears .own rapidly and this wear is materially increased by the stretching or lengthening of the fabric,,which is considerable because of its'weak tensile strength. The use of such'a fabric therefore requires a frequent taking up of the slack due to stretch and eventual replacement after a short pe riod of time.-

The purpose of my improvement is to lengthen the life of the fabric both by de creasing its stretch and increasing its wear,

and in carryingout this object I have introduced into the warp of the fabric which carries the more severe longitudinal strain when in use, interspersed warp wires of stainless steel preferably at regularly spaced intervals 3 throughout, the width of the fabric. The main body of the fabric may beconstituted as at present, of coppery wires both as to the weft and remainlng warp wires, the in vention being in the substitution for eve alternate coppery warp, or for every thir fourth, fifth, etc. coppery warp and as few as for one in twent of the coppery warp, of 'a-warp of stain esssteel or equivalent metal which is harder, more durable and of 0 considerably greater tensile strength thanbronze, brass or copper-wires while being of. an equally rustless character therewith. The

. substitut d warp of stainless steel may be ofthe same size as its displaced coppery warp and in all other respects the characteristics of the wire fabric, as to mesh, size of wires, etc. may conform to standard practice so that its paper making characteristics may remain unchanged and suit the various purposes desired forsuch fabric.

aper making machine the C a the interspersed warps of stainless steel.

In the embodiment'shown, the wires are all of the same size, the warp and weft wires are equally spaced and are interwoven with a plain weave. It will be understood however,

that variations in size and spacing of the wires and character of the weave may be resorted to and still retain the improved results of my invention.

It' will be noted also in the embodiment illustrated, that the stainless steel warp wires a are inserted at intervals of every seventh warp, which-has been found to be asuitable average spacing for a Fourdrinier fabric of medium mesh and size of wire. In an actual fabric this spacing between the steel warp wires will be approximately 5/32 of an inch.

There has been no attempt to show the drawing in scale. In many cases, it may be found desirable to change the spacing of the steel wires from the precise form shown and described, and particularly for increasing the longitudinal strength at the selv e, the steel wires may be more closely spaced t an as here shown.

The advantages flowin from the present improvement are manifol the principal ones being that of greater tensile strength and wearing qua-lit as reviously indicated. The harder,-more ura le steel wire assumes the greater burden of wear on the rolls when the fabric is in use, even though said steel wires may be of no greater size and therefore do not project from the surface ofthe fabric. Furthermore, the stretching of the fabric is greatly reduced by the use of the interspersed steel wires and the coppery wires'are thus kept from being drawn out, which would shorten their wearing life. Moreover, when the steel wires eventually weaken, usually due to a gradual hardening of the metal from repeated bendin the coppery wires in the main body of the fa ric will be found still service able. and capable of much further use, thus giving to the fabric substantially a double one warp wire of harder metal for every wear quality. seventh warp wire of softer metal.

In the manufacture of Fourdrinier wire Intestimony whereof I have afiixed my sigfabric, it is the common practice to anneal nature. 5 the coppery wires beforeuse to render them GUY M. PETERSON.

soft and more flexible for their travel over the rolls of the machine. But the stretching of such fabrics when in use destroys the annealed property of the coppery wires and tends to make them more stiff and brittle, whereupon 5 they break more easily. By the use of my invention most of this stretching and consequent increase of brittleness in the coppery wires is prevented, and said wires are kept in their soft annealed condition for a long wearing life without brealdng. What I claim is: 1. A paper making wire fabric comprising interwoven warp and weft wires, the weft wires and some of the warp wires being of a5 coppery metal such as brass or bronze and other warp wires of stainless steel interspersed among said coppery warp wires.

2. A paper making wire fabric comprising a plain weave of warp and weft wires, sai w warp wires being of uniform diameter, the weft wires and some of the warp wires being of coppery metal such as brass or bronze and other warp wires of stainless steel interspersed among said coppery warp wires. on 3. A paper making wire fabric comprising interwoven warp and weft wires, the weft wires and some of the warp wires being of of coppery metal such as brass or bronze and g other. warp wires of stainless steel inter-- "m spersed among said coppe warp wires-at regular. intervals transverse y of the fabric. 4. A paper making wire fabric comprising interwoven warp and weft wires, the weft Wires and some of the warp wires being of v.5 coppery metal such as brass or bronze and other warp wires of stainless steel interspersed among said coppery warp wires at intervals of approximately of an inch transversely of the fabric. A may 5. A paper makin wire fabric comprising interwoven warp and weft wires forming the body of the fabric, the weft wires and some of the warp wires being of relatively soft metal and the remaining warp wires being of rela- 1:

tively hard metal and of greater tensile strength than the first mentioned warp wires and interspersed at intervals in thebody of the fabric among the warps of softer metall 6. A paper making wire fabric comprising v a Ian interwoven warp and weft wires forming the body of the fabric, the weft wires and some of the warp wiresbeing of relatively soft metal and the remaining warp wires lie-- ing of relativelyjhard-"metal and of reater H!!! tensile strength than the first mentione warp wires and interspersed at intervals in the bod of the fabric among-the warps of softer meta said intervals of dispersion transversely of 0 the body of the fabric being in the order of no 

